More Background
The equation velocity = frequency x wavelength can be used to determine the wavelength of a wave of known velocity and frequency:
Velocity of a photon in a vacuum = c ? 3 x 108 ms-1? 108 ms-1
Frequency of visible light ? 1014 Hz
λ = wavelength = (c / frequency) ? (108 ms-1)/(1014 Hz ) ? 10-6 m
This is one millionth of a metre, one thousandth of a millimetre.


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